催化作用
香兰素
物理吸附
木质素
化学
氧化剂
香兰素酸
混合氧化物
氧化物
无机化学
氧化还原
核化学
有机化学
作者
Wonjin Jeon,Il-Ho Choi,Jiyeon Park,Jin-Suk Lee,Kyung-Ran Hwang
标识
DOI:10.1016/j.cattod.2019.12.037
摘要
Alkaline wet oxidation of lignin was performed to study the effect of Cu-Mn mixed oxide catalysts on the production of vanillin at between 120–180 °C using H2O2 as an oxidizing agent. The mixed oxide catalysts were prepared by a sol-gel method with mixing ratios of Cu to Mn between 0.25 and 0.75 and characterized by XRD, XPS, N2-physisorption, SEM-EDS, and H2-TPR. The XRD and N2-physisorption analyses showed a non-stoichiometric spinel structure (Cu1.5Mn1.5O4) and a relatively high BET surface area of the mixed oxides compared with pure Cu and Mn oxides, respectively. In addition, the Cu-Mn mixed oxide catalysts exhibited better redox properties and a higher catalytic performance for lignin oxidation to vanillin and other aromatic oxygenates. Higher Cu contents in the mixed oxide catalysts promoted the over-oxidation of vanillin producing vanillic acid along with the formation of more surface oxygen species on the catalyst surface. Finally, a possible reaction pathway for the catalytic conversion of lignin to vanillin was proposed.
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